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Verilog Tutorial.
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Digital Basics Tutorial.
Full-Adder discussion
Full-adder is a digital circuit to perform arithmetic sum of two bits and a previous carry. It is represented in the diagram and truth table below.
Click here for Verilog RTL example and test-bench for full-adder.
In_x
In_y
Carry_in
sum_out
Carry_out
0
0
0
0
0
0
0
1
1
0
0
1
0
1
0
0
1
1
0
1
1
0
0
1
0
1
0
1
0
1
1
1
0
0
1
1
1
1
1
1
4 - bit Binary Adder implementation, block diagram and discussion.
4 - bit Binary Adder - Subtractor implementation, block diagram and discussion.
Full Adder Truth table (FA) below:
So the expressions for the full adder are:-

Sum_out = (in_x) XOR (in_y) XOR (carry_in)

Carry_out = (in_x) AND (in_y) OR (in_x xor in_y) and carry_in
In_x
In_y
Carry_in
Sum_out
Carry_out
Block Diagram of Full Adder
FA
X
Previous Carry
Y
Sum
Carry
The circuit involves two half-adders & one OR gate. Alternately 2 XOR gates, 2 AND gates and 1 OR gate. Circuit of full-adder is discussed below:
Interview Questions. Main, FPGA, Digital Fundamentals
Clock Crossing Async FIFO Half Adder Full Adder Binary Adder Overflow Overflow Det Adder-Subtractor Multiplier Parity check RTL guidelines NAND to INVERTER VHDL RTL Arith Micro-ops Stack Org Parallel proc. Pipeline proc CMOS Intro
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NEXT : 4 bit binary ADDER discussion.
Half Adder.
Binary Adder.
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